<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="a.php" autocomplete="on">
        姓名：<input placeholder="请输入用户名" type="text" name="uname2">
        <hr>
        邮箱：<input type="email" required>
        <hr>

        <button>提交</button>
    </form>
    <hr>
    <form action="a.php">
        <input type="url" name="x">
        <hr>
        搜搜：<input type="search" name="y" required>
        <hr>
        音量：<input autofocus type="number" step="10" min="0" max="100">
        <input type="range" min="0" max="100">
        <input type="range"  step="10" min="0" max="100">
        <hr>
        <input type="submit">
    </form>
    <hr>
    <form action="b.php" id="f1">
        <button>提交</button>
    </form>
    <input type="text" name="sex" placeholder="性别输入" form="f1">
</body>
</html>